Vacuole-free polymer granulates

US6551538B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Thomas Elsner · Düsseldorf, DE
• Jürgen Heuser · Krefeld, DE
• Christian Kords · Krefeld, DE

Key dates

• Filing date: Sep 27, 2000
• Grant date: Apr 22, 2003
• Expiry date: Sep 27, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2369/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for preparing a vacuole-free polymer is disclosed. Extruded polymer resin is cooled at a rate of less than 50° C./sec. to a temperature that is 1 to 20° C. above the glass transition temperature of the polymer resin and the resin is then cut.